I think, for Fuji, having the same build quality for the X100/E series/T series/Pro series could have the built quality, since only one model at a time is on the market as current... save the the "T" series which has 2 models that are current. (T2, and T10... T1 will be discontinued if it isn't already)
And that it seems that the X100T/E2/Pro 2, are considered top models for their line, and very different in design.
I have owed an X-E2, and own an X100T now, and they are similar in that they are both a RF like design, with the X100T going a step closer with a hybrid VF. and fixed lens, and the Pro adding interchangeable lenses.
The X100T could use weather sealing, being a fixed lens camera this should be easier, and a shutter to 100k..I find the X100T very durable as is, just these two added features would be nice, but a deal breaker.